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MC34064 Datasheet, PDF (1/12 Pages) ON Semiconductor – UNDERVOLTAGE SENSING CIRCUIT | |||
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MC34064, MC33064,
NCV33064
Undervoltage Sensing
Circuit
The MC34064 is an undervoltage sensing circuit specifically
designed for use as a reset controller in microprocessorâbased
systems. It offers the designer an economical solution for low voltage
detection with a single external resistor. The MC34064 features a
trimmedâinâpackage bandgap reference, and a comparator with
precise thresholds and built-in hysteresis to prevent erratic reset
operation. The open collector reset output is capable of sinking in
excess of 10 mA, and operation is guaranteed down to 1.0 V input with
low standby current. The MC devices are packaged in 3âpin TO-92,
micro size TSOPâ5, 8âpin SOICâ8 and Micro8t surface mount
packages. The NCV device is packaged in SOICâ8 and TOâ92.
Applications include direct monitoring of the 5.0 V MPU/logic
power supply used in appliance, automotive, consumer and industrial
equipment.
Features
⢠TrimmedâInâPackage Temperature Compensated Reference
⢠Comparator Threshold of 4.6 V at 25°C
⢠Precise Comparator Thresholds Guaranteed Over Temperature
⢠Comparator Hysteresis Prevents Erratic Reset
⢠Reset Output Capable of Sinking in Excess of 10 mA
⢠Internal Clamp Diode for Discharging Delay Capacitor
⢠Guaranteed Reset Operation with 1.0 V Input
⢠Low Standby Current
⢠Economical TOâ92, TSOPâ5, SOICâ8 and Micro8 Surface Mount
Packages
⢠NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
⢠PbâFree Packages are Available
Input 2 (2)
Reset
1 (1)
1.2 Vref
GND 3 (4)
=
Sink Only
Positive True Logic
Pin numbers adjacent to terminals are for the 3âpin TOâ92 package.
Pin numbers in parenthesis are for the 8âlead packages.
This device contains 21 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2005
1
February, 2005 â Rev. 12
http://onsemi.com
1
2
3
8
1
8
1
5
1
TOâ92
P SUFFIX
CASE 29
Pin 1. Reset
2. Input
3. Ground
SOICâ8
D SUFFIX
CASE 751
Micro8
DM SUFFIX
CASE 846A
TSOPâ5
SN SUFFIX
CASE 483
Pin 1. Reset
2. Input
3. Ground
4. NC
5. NC
PIN CONNECTIONS
Reset 1
Input 2
N.C. 3
Ground 4
8 N.C.
7 N.C.
6 N.C.
5 N.C.
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
Publication Order Number:
MC34064/D
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